Cleaning out stuff and came across a tank/reg I made for my son for Halloween when he was 1 year old. Used a 7-UP bottle, electrical wire conduit, duct tape, electrical tape and styrofoam. Thought you would get a kick out of it. Mark

"The diver who collects specimens of underwater life has fun and becomes a keen underwater observer. .. seek slow-moving or attached organisms such as corals, starfish, or shelled creatures." (Golden Guide to Scuba Diving, 1968)
